The literature review of the theoretical part focused on previous studies and scientific publications. The methods used for the research, the hypothesis and the analytical framework were chosen according to the literature review. In the empirical part the current state of the residential construction unit of NCC Suomi Oy was presented and based on the current state and literature review model for the production process was created. Finally, the model was tested and compared in case study. Based on these, the process description of the production phase was finished as well as the opportunities and challenges that emerged during the research. The case study focused on the first Swan project of the company´s residential construction unit.

The research confirms the hypothesis set for it: Construction according to the environmental certification requires changes in the construction process. The prepared process description includes core processes that support the implementation of environmental certification, including the implementation of a company's responsible building site-concept, quality assurance, materials and chemicals management,information delivery within the site, setting goals and responsibilities, resource setting for process management and cost management during the construction phase. The biggest challenges for the management of the building process were the high construction costs, the poor knowledge of environmental certifications and sustainable construction in the field, the setting and commitment of common goals for different parties in the construction site, and the construction sector's resistance to change.Opportunities were seen as the development of the company's internal operations, the competitive advantage and the strong market value of the environmental certification.